diff --git a/libguile/dynwind.h b/libguile/dynwind.h
index b207d83b8..920e9a83c 100644
--- a/libguile/dynwind.h
+++ b/libguile/dynwind.h
@@ -47,7 +47,7 @@ typedef enum {
 } scm_t_frame_flags;
 
 typedef enum {
-  SCM_F_WIND_EXPLICITELY = (1 << 0)
+  SCM_F_WIND_EXPLICITLY = (1 << 0)
 } scm_t_wind_flags;
 
 SCM_API void scm_begin_frame (scm_t_frame_flags);
@@ -58,6 +58,11 @@ SCM_API void scm_on_unwind (void (*func) (void *), void *data,
 SCM_API void scm_on_rewind (void (*func) (void *), void *data,
 			    scm_t_wind_flags);
 
+SCM_API void scm_on_unwind_with_scm (void (*func) (SCM), SCM data,
+				     scm_t_wind_flags);
+SCM_API void scm_on_rewind_with_scm (void (*func) (SCM), SCM data,
+				     scm_t_wind_flags);
+
 #ifdef GUILE_DEBUG
 SCM_API SCM scm_wind_chain (void);
 #endif /*GUILE_DEBUG*/